Hot water problem

[jugglingjim]

Hi
I have an Alpha 240p combi boiler, My hot water from upstairs/downstairs taps (both mixer taps) is only lukewarm. I have had an engineer from E On come out and he has done various tests and has found nothing wrong with the boiler, has anyone any suggestions
cheers
JJ

 

[Dan]

Welcome to Plumbing Forum | Plumbing Advice | Plumbers Forums | A forum for plumbers advice in the UK!

Hello jugglingjim, welcome aboard www.UKPlumbersForums.co.uk. Stick around, I'm sure you'll like the place. 🙂

 

[Plumbstar Tom]

is this all taps that are fed from the boiler? is there a shower fed from it as well?

 

[jugglingjim]

Hi Tom
There is mixer tap in the kitchen a mixer tap in the bathroom and a thermostatic shower. If I run the cold tap upstairs then the hot water is fine downstairs and the shower is also hot. Any ideas
cheers
jj

 

[Plumbstar Tom]

ah, you sound like you have too much pressure for the combi to cope with

A PRV should be your cure (pressure reducing Valve) set to 2.5 - 3.0 bar

 

[jugglingjim]

Hi Tom
This is the first time that this has happened, why would that be?
cheers
JJ

 

[Plumbstar Tom]

water board increasing pressure maybe?

Try turning your internal stopcock right down

or on the taps that are luke warm dont open them fully open them less then half way and check temp

 

[Puddle]

Hi jj,Welcome,hope you enjoy the forums

Think your thermostatic shower maybe has a faulty non return valve ,allowing cold into hot side of pipework

imho

 

[PlumbBobBob]

hi welcome to the forum

steve

 

[jugglingjim]

Hi Puddle
If the non return valve on the shower was faulty would that affect the downstairs hot water taps?
I have had a plumber come out and he has confirmed that the plumbing side of things are ok and suggested an electronic fault in the boiler.
cheers
JJ

 

[Plumbstar Tom]

did you try only turning the taps on a little?

could be a numerous things but your plumber should have diagnose the fault in the boiler if thats where it lies

 

[kiveton Gas]

some times the tempeture senors may need changing these are cheap to replace usually about 15 each to buy. Failing that your heat exchanger may be full of limescale , this may need to be cleaned descaled, this is usually expensive hence netter off replacing boiler.

 

[Dotty]

The most likely would be the thermostatic shower. a couple of double check valves would be the quickest and cheapest solution.

 

[oldplumber]

guys, he gets hot water when the cold is flowing elsewhere so the boiler is working ok, doesnt need thermistor etc, could need a flow reducer on cold inlet or prv or therostatic mixer is faulty as previously mentioned.

 

[Dotty]

guys, he gets hot water when the cold is flowing elsewhere so the boiler is working ok, doesnt need thermistor etc, could need a flow reducer on cold inlet or prv or therostatic mixer is faulty as previously mentioned.

<<Doffs his cap to Oldplumber>>

 

[jugglingjim]

Hi
If the thermostat on the shower is faulty would that affect the hot water tap downstairs or would that just affect the temperture in the shower.
cheers
Jim